Whatsapp is started in the year 2009.Now a days it is very useful and helpful to everyone smartphone users.By this whatsapp we can send messages, pics, audio, etc.Recently whatsapp has launched video calling also.I think whatsapp is easiest then other apps to share our feelings wit our friends, relatives, etc.Even now a days people who dont no how to text, they are sending voice messages in whatsapp.I think now a days whatsapp is successfully running app.